/docs/hybrid/research/comparison-summary.md

Docling vs OpenDataLoader Output Comparison

Test Document

• File: 01030000000045.pdf (1 page with table)

Element Count Comparison

Category	Docling	OpenDataLoader
Tables	1	1
Text elements	5	4 paragraphs
Images	0	1
Headings	(N/A - uses labels)	1

Text Element Labels (Docling)

Label	Count
caption	1
footnote	1
page_footer	1
page_header	1
text	1

Table Structure Comparison

Property	Docling	OpenDataLoader
Rows	9	3
Columns	3	3
Total cells	26	9

Note: Docling detects more rows in the table structure. This may be due to:

• Different table detection algorithms
• OpenDataLoader may have merged some rows
• Different handling of header rows

Bounding Box Comparison (Table)

System	l/left	t/top	r/right	b/bottom	Origin
Docling	53.22	439.98	373.94	234.74	BOTTOMLEFT
OpenDataLoader	54.0	234.44	372.73	440.21	BOTTOMLEFT

Coordinate mapping: Both use BOTTOMLEFT origin.

• Docling: {l, t, r, b} where t=top, b=bottom
• OpenDataLoader: [left, bottom, right, top]

So the actual coordinates match closely:

• Left: 53.22 ≈ 54.0
• Bottom: 234.74 ≈ 234.44
• Right: 373.94 ≈ 372.73
• Top: 439.98 ≈ 440.21

Schema Mapping Summary

Docling Type	OpenDataLoader Type
texts (label: text)	paragraph
texts (label: section_header)	heading
tables	table
pictures	image
texts (label: page_header)	paragraph (filtered as header)
texts (label: page_footer)	paragraph (filtered as footer)
texts (label: caption)	paragraph
texts (label: footnote)	paragraph

Key Differences

1. Type naming: Docling uses label field for text types, OpenDataLoader uses type
2. Table structure: Docling detects more detailed row structure
3. Coordinate format: Same origin but different field order
4. Heading detection: Docling uses SectionHeaderItem with level, OpenDataLoader uses heading type with level